FR527754A - Improvements to sound recording and reproducing devices - Google Patents

Improvements to sound recording and reproducing devices

Info

Publication number
FR527754A
FR527754A FR527754A FR527754DA FR527754A FR 527754 A FR527754 A FR 527754A FR 527754 A FR527754 A FR 527754A FR 527754D A FR527754D A FR 527754DA FR 527754 A FR527754 A FR 527754A
Authority
FR
France
Prior art keywords
sound recording
reproducing devices
reproducing
devices
sound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
FR527754A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PERFEK TONE CORP
Original Assignee
PERFEK TONE CORP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PERFEK TONE CORP filed Critical PERFEK TONE CORP
Application granted granted Critical
Publication of FR527754A publication Critical patent/FR527754A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/44—Styli, e.g. sapphire, diamond
    • G11B3/50—Anvils or other supports opposing stylus forces
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
FR527754A 1920-01-31 1920-11-29 Improvements to sound recording and reproducing devices Expired FR527754A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US355428A US1344931A (en) 1920-01-31 1920-01-31 Reproducer for talking-machines

Publications (1)

Publication Number Publication Date
FR527754A true FR527754A (en) 1921-10-29

Family

ID=23397400

Family Applications (1)

Application Number Title Priority Date Filing Date
FR527754A Expired FR527754A (en) 1920-01-31 1920-11-29 Improvements to sound recording and reproducing devices

Country Status (3)

Country Link
US (1) US1344931A (en)
FR (1) FR527754A (en)
GB (1) GB158538A (en)

Also Published As

Publication number Publication date
US1344931A (en) 1920-06-29
GB158538A (en) 1921-09-22

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